Starting with the proposal by [1]}, the medical literature contains a number of detailed descriptions on operating KEPs (e.g. a survey by [2]}, or the recent study by [3]} for the US). Thorough review of European KEPs has also been made recently and published as two deliverables of ENCKEP (European Network for Collaboration on Kidney Exchange Programs) COST Action: the general operation of programs is summarized in [4]} and the optimization aspects in [5]}. Well-established quality estimators of the quality of living donations were recently proposed in the medical literature in [6]} and [7]}.
